The new cooling technology is based on a model create by Einstein with 78 years ago. The refrigerator that works without electricity use ammonia, water and butane in place of Freon.

The environment-friendly cooling technology uses ammonia, butane and water instead of Freon, substance so harmful to the environment, and constitutes an important step in combating climate change, writes the British daily The Guardian. "

The Oxford University engineers have announced that they have completed a prototype of a refrigerator invented by Einstein and his colleague, the physicist Leó Szilárd. It has no mobile parts and uses only gases under pressure for the process of cooling food.According to Oxford engineers, the technology is follow the working principle according to which the liquids concoct to lower temperatures when air pressure around them is less.

"If you get on the top of the mountain Everest, you'll find that the water will boil at a temperature much lower than when the process takes place at the sea level. And that's because the air pressure is much lower in high heights," explains the engineer Malcolm McCulloch .

It will use solar energy

Einstein's refrigerator was used until the 1950s, when more efficient technologies based on freon have taken it place. Engineers from Oxford argue that the effectiveness of the new refrigerator will be four times higher than that of the technology developed by Einstein, that will replace the types of gases used in refrigeration.

Also, they aim to develop the project so that in future the only form of energy supply of a refrigerator to consist in a heating pump through solar energy.

Whether that use Freon or other gases, a refrigerator operates on a sector-pressure and low temperature - inside - and on a pressure and high temperature - the radiator from the back. The sectors are separated by a pump to get gas from the inside, causing such a difference in pressure and a difference of temperature.